[Bug 233664] enable LLVM libunwind for armv7, armv6

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233664

--- Comment #23 from commit-hook@FreeBSD.org ---
A commit in branch stable/12 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=33b6e67445548c4a5e81fe6d626dbb29c9246042

commit 33b6e67445548c4a5e81fe6d626dbb29c9246042
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2020-08-06 19:08:28 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2021-12-22 09:58:21 +0000

    Reapply r355803 (by mmel):

    Fix LLVM libunwnwind _Unwind_Backtrace symbol version for ARM.
    In original  GNU libgcc, _Unwind_Backtrace is published with GCC_3.3
version
    for all architectures but ARM. For ARM should be publishes with GCC_4.3.0
    version. This was originally omitted in r255095, fixed in r318024 and
omitted
    aging in LLVM libunwind implementation in r354347.

    For ARM _Unwind_Backtrace should be published as default with GCC_4.3.0
    version , (because this is right original version) and again as
    normal(not-default) with GCC_3.3 version (to maintain ABI compatibility
    compiled/linked with wrong pre r318024 libgcc)

    PR:     233664
    (cherry picked from commit e8141ad1df2098dd3f6d627c49ce99307315f5fd)

 contrib/llvm-project/libunwind/src/UnwindLevel1-gcc-ext.c | 4 ++++
 1 file changed, 4 insertions(+)

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